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Refrigerated Centrifuge Sigma 6-16KS
8 Maintenance and service
Version 06/2012, Rev. 1.11 of 06/04/2016 • sb
63 / 91
Translation of the original operating manual, part no. 0702202
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8.1.3.1
Plastic accessories
The chemical resistance of plastic decreases with rising temperatures (see
chapter 11.5 - "Resistance data").
• If solvents, acids, or alkaline solutions have been used, clean the plastic
accessories thoroughly.
WARNING
Plastic accessories must not be greased!
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8.1.4
Rotors, buckets and carriers
Rotors, buckets and carriers are produced with the highest precision, in
order to withstand the permanent high stress from high gravitational fields.
Chemical reactions as well as stress-corrosion (combination of oscillating
pressure and chemical reaction) can affect or destroy the metals. Barely
detectable cracks on the surface can expand and weaken the material
without any visible signs.
• Check the material regularly (at least once a month) for
– cracks
– visible damage of the surface
– pressure marks
– signs of corrosion
– other changes.
• Check the bores of the rotors and multiple carriers.
• Replace any damaged components immediately for your own safety.
• Grease the rotor tie-down screw after cleaning with grease for load
bearing bolts (part no. 70284) and spread the grease with a cloth.
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8.1.5
Load bearing bolts
Only greased load bearing bolts ensure the even swinging of the buckets
and, therefore, the quiet run of the centrifuge. Non-greased bolts can lead
to a system shut-down due to imbalances.
Apply a small quantity of grease (part no. 70284) to the load bearing bolts
of the rotor and buckets after each cleaning.
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